"It would've been fine if it hadn't been for those meddling kids!" is basically the message Otto Pérez Molina is sending about the role of the U.S. government in his downfall. It is remarkable and so rare for the U.S. to be "blamed" for helping to do precisely the right thing in Central America. CICIG has been entirely positive for Guatemalan democracy, and the Obama administration actively supported it. This is the sort of blame you can believe in.
This is also why you see governments in El Salvador and Honduras saying they don't need a CICIG. When the Mystery Machine shows up, it's all over.